/* =====================================================================
   Wanli Li — academic homepage
   Aesthetic: ink-on-paper, editorial serif, monochrome with blue pops
   Fonts: Fraunces (display) · Newsreader (body) · Space Mono / Archivo (labels)
   ===================================================================== */

:root {
  /* --- ink & paper --- */
  --ink: #16181c;
  --soft: #33373d;
  --faint: #6b7178;
  --line: #e6e7e9;
  --bg: #ffffff;
  --bg-2: #f2f3f4;
  --card: #ffffff;

  /* --- functional accent (links, active states) --- */
  --accent: #2f6fb5;
  --accent-soft: rgba(47, 111, 181, 0.12);

  /* --- pops --- */
  --pop-red: #e0503a;
  --pop-blue: #2f6fb5;
  --pop-amber: #e0a12b;
  --pop-green: #2f9068;
  --marker: rgba(224, 161, 43, 0.28);

  /* --- type --- */
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Newsreader", Georgia, serif;
  --font-mono: "Space Mono", "SFMono-Regular", monospace;
  --font-ui: "Archivo", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-name: "Pacifico", "Fraunces", cursive;

  --radius: 12px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 20px;
  font-weight: 420;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* paper grain overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.4;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.4'/%3E%3C/svg%3E");
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .15s var(--ease), color .15s var(--ease);
}
a:hover { border-bottom-color: var(--accent); }

/* ---------- TOP NAV ---------- */
.topnav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(10px) saturate(1.3);
  border-bottom: 1px solid var(--line);
}
.topnav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 13px 40px;
  display: flex;
  gap: 26px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
}
.topnav a {
  position: relative;
  color: var(--faint);
  border-bottom: none;
  padding: 2px 0;
  transition: color .3s var(--ease);
}
.topnav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 1.5px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .32s var(--ease);
}
.topnav a:hover { color: var(--ink); border-bottom: none; }
.topnav a:hover::after { transform: scaleX(1); }
.topnav .nav-home { color: var(--ink); font-weight: 700; }

/* ---------- TWO-COLUMN LAYOUT ---------- */
.layout {
  max-width: 1180px;
  margin: 0 auto;
  padding: 48px 40px 80px;
  display: flex;
  align-items: flex-start;
  position: relative;
  z-index: 2;
}
.sidebar {
  width: 22%;
  flex-shrink: 0;
  position: sticky;
  top: 80px;
  text-align: center;
}
.content {
  width: 78%;
  padding-left: 5%;
}

/* ---------- SIDEBAR / AUTHOR ---------- */
.author-avatar {
  width: 175px;
  height: 175px;
  margin: 0 auto 18px;
  border-radius: 50%;
  overflow: hidden;
  padding: 0;
  border: 6px solid var(--card);
  box-shadow: 0 14px 34px rgba(20,24,24,0.14);
  transition: box-shadow .35s var(--ease);
}
.author-avatar:hover { box-shadow: 0 18px 40px rgba(20,24,24,0.2); }
.author-avatar img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; display: block; }

.author-name {
  font-family: var(--font-name);
  font-size: 1.85rem;
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: 0;
  color: var(--ink);
  margin-bottom: 12px;
  padding: 0.06em 0.04em 0.12em;
}
.author-name .cn {
  display: block;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 400;
  color: var(--faint);
  margin-top: 6px;
}

.author-affil {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 3px;
}
.author-affil-sub {
  font-family: var(--font-ui);
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--faint);
  margin-bottom: 18px;
}

.author-links { list-style: none; }
.author-links li { padding: 4px 0; }
.author-links a {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  border-bottom: none;
  transition: color .3s var(--ease);
}
.author-links a:hover { color: var(--faint); border-bottom: none; }

/* ---------- BIO ---------- */
.bio {
  font-size: 1.02rem;
  line-height: 1.72;
  color: var(--soft);
  max-width: 74ch;
  margin-bottom: 10px;
}
.bio strong { font-weight: 600; color: var(--ink); }
.bio em { font-style: italic; color: var(--ink); }
.bio a {
  color: var(--ink);
  border-bottom: none;
  text-decoration: underline;
  text-decoration-color: var(--pop-blue);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 2.5px;
  text-decoration-skip-ink: none;
}
.bio a:hover { color: var(--pop-blue); text-decoration-thickness: 2px; }
.bio-cta {
  margin-top: 14px;
  padding: 12px 18px;
  background: var(--bg-2);
  border: 1.5px solid var(--line);
  border-radius: 10px;
  font-size: 0.95rem;
  color: var(--soft);
}
.nowrap { white-space: nowrap; }

/* ---------- SECTION HEADERS ---------- */
h2 {
  font-family: var(--font-display);
  font-size: 1.85rem;
  font-weight: 450;
  letter-spacing: -0.02em;
  line-height: 1.08;
  font-variation-settings: "opsz" 30, "wght" 450, "WONK" 0;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 2.5px solid var(--ink);
}
section { margin-bottom: 46px; scroll-margin-top: 4.5rem; }
.about { margin-bottom: 38px; }

/* ---------- NEWS (timeline) ---------- */
.news ul, .misc ul { list-style: none; }
.news ul { position: relative; padding-left: 2px; }
.news ul::before {
  content: "";
  position: absolute;
  top: 1rem;
  bottom: 1rem;
  left: 4px;
  width: 1.5px;
  background: var(--line);
}
.news li {
  position: relative;
  display: flex;
  gap: 16px;
  padding: 8px 0 8px 26px;
  font-size: 0.95rem;
  color: var(--soft);
  align-items: baseline;
}
.news li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--card);
  border: 2px solid var(--faint);
  box-shadow: 0 0 0 4px var(--card);
  z-index: 1;
  transition: transform .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}
.news li:first-child::before {
  background: var(--pop-blue);
  border-color: var(--pop-blue);
  box-shadow: 0 0 0 4px var(--card), 0 0 0 6px var(--accent-soft);
}
.news li:hover::before {
  transform: scale(1.25);
  border-color: var(--pop-blue);
  background: var(--pop-blue);
}
.news strong { color: var(--ink); font-weight: 600; }
.news em { font-style: italic; color: var(--ink); }
.date {
  flex-shrink: 0;
  font-family: var(--font-ui);
  color: var(--faint);
  font-variant-numeric: tabular-nums;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  min-width: 56px;
  white-space: nowrap;
}

/* ---------- TALKS ---------- */
.talks ul { list-style: none; }
.talks li {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 6px 18px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
.talks li:last-child { border-bottom: none; }
.talk-date {
  font-family: var(--font-ui);
  color: var(--faint);
  font-variant-numeric: tabular-nums;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.talk-title {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.talk-venue {
  text-align: right;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--faint);
}

/* ---------- RESEARCH ---------- */
.research-note {
  font-size: 0.92rem;
  color: var(--faint);
  margin-bottom: 28px;
  margin-top: -4px;
}
.cofirst { color: var(--pop-red); font-weight: 600; font-size: 0.85em; vertical-align: super; line-height: 0; }

.thread { margin-bottom: 20px; }
.thread + .thread { margin-top: 8px; }
.thread-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 4px;
  margin-top: 30px;
  display: inline-block;
  border-bottom: none;
  background-image: linear-gradient(var(--marker), var(--marker));
  background-repeat: no-repeat;
  background-position: 0 88%;
  background-size: 100% 0.36em;
  padding: 0 0.08em 2px;
}
.thread-desc {
  font-size: 0.95rem;
  color: var(--faint);
  margin-bottom: 8px;
}

.pub {
  display: grid;
  grid-template-columns: 290px 1fr;
  gap: 1.6rem;
  align-items: start;
  padding: 1.4rem 0;
  border-top: 1px solid var(--line);
  border-bottom: none;
}
.pub:first-of-type { border-top: none; }

.pub-thumb {
  display: block;
  width: 100%;
  border-radius: 6px;
  overflow: hidden;
  background: var(--bg-2);
  border: 1px solid var(--line);
  box-shadow: none;
}
.pub-thumb img {
  width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
  border-radius: 0;
  box-shadow: none;
  transition: transform .5s var(--ease);
}
.pub:hover .pub-thumb img { transform: scale(1.05); }

.pub-body { min-width: 0; }
.pub-title {
  font-family: var(--font-display);
  font-size: 1.28rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.32;
  margin: 0.1rem 0 0.5rem;
}
.pub-title a { color: var(--ink); border-bottom: none; }
.pub-title a:hover { color: var(--pop-blue); border-bottom: none; }

/* hand-drawn brush underline for MY name */
.pub-authors {
  font-size: 1rem;
  color: var(--soft);
  line-height: 1.56;
  margin-bottom: 8px;
}
.pub-authors strong {
  position: relative;
  color: var(--ink);
  font-weight: 600;
  white-space: nowrap;
  padding-bottom: 0.22em;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='12' viewBox='0 0 120 12'%3E%3Cpath d='M2,7 C22,3 42,9 62,6 C82,3 100,8 118,5' fill='none' stroke='%2316181c' stroke-width='3.4' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 100% 0.5em;
}

/* venue line + pill badges */
.pub-venue {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem 0.7rem;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 10px;
}
.badge {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
  padding: 0.28rem 0.65rem;
  border-radius: 40px;
  margin-right: 0;
  vertical-align: baseline;
}
.badge.first {
  color: var(--pop-red);
  background: rgba(224, 80, 58, 0.12);
  border: 1.5px solid rgba(224, 80, 58, 0.55);
}
.badge.cofirst-b {
  color: var(--pop-amber);
  background: rgba(224, 161, 43, 0.14);
  border: 1.5px solid rgba(224, 161, 43, 0.6);
}
.badge.conf {
  color: var(--pop-blue);
  background: var(--accent-soft);
  border: 1.5px solid rgba(47, 111, 181, 0.55);
}
.badge.report {
  color: var(--pop-green);
  background: rgba(47, 144, 104, 0.12);
  border: 1.5px solid rgba(47, 144, 104, 0.55);
}
.cite {
  font-family: var(--font-ui);
  color: var(--faint);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  text-transform: none;
}

.pub-tldr {
  font-size: 0.98rem;
  color: var(--soft);
  margin-bottom: 12px;
  line-height: 1.6;
}

/* pill link buttons */
.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  font-size: 1rem;
}
.pub-links .sep { display: none; }
.pub-links a {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 0.3rem 0.85rem;
  border-radius: 40px;
  box-shadow: 0 1px 2px rgba(22,24,28,0.08);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease),
              background .28s var(--ease), border-color .28s var(--ease);
}
.pub-links a:hover {
  background: var(--bg-2);
  border-color: var(--faint);
  transform: translateY(-1px);
  box-shadow: 0 3px 8px rgba(22,24,28,0.12);
}

/* ---------- EXPERIENCE ---------- */
.experience .exp-item {
  display: flex;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.experience .exp-item:last-child { border-bottom: none; }

.exp-logo {
  width: 52px;
  height: 52px;
  flex-shrink: 0;
  border-radius: 10px;
  background: var(--card);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
}
.exp-logo img { max-width: 100%; max-height: 100%; object-fit: contain; display: block; }

.exp-body { flex: 1; min-width: 0; }
.exp-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}
.exp-org {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.exp-date {
  font-family: var(--font-ui);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--faint);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.exp-role {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--pop-blue);
  margin: 4px 0 7px;
}
.exp-desc {
  font-size: 0.98rem;
  color: var(--soft);
  line-height: 1.6;
}
.exp-desc strong { font-weight: 600; color: var(--ink); }
.exp-desc em { font-style: italic; }
.exp-mentor {
  font-size: 0.9rem;
  color: var(--faint);
  margin-top: 6px;
}
.exp-mentor a { color: var(--soft); border-bottom: none; }
.exp-mentor a:hover { color: var(--pop-blue); border-bottom: 1px solid var(--pop-blue); }

/* ---------- SKILLS ---------- */
.skill-row {
  display: flex;
  gap: 18px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.97rem;
}
.skill-row:last-child { border-bottom: none; }
.skill-key {
  flex: 0 0 110px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  padding-top: 4px;
}
.skill-val { flex: 1; color: var(--soft); }

/* ---------- EDUCATION ---------- */
.misc .edu { margin-bottom: 18px; }
.misc .edu li {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.misc .edu li:last-child { border-bottom: none; }
.edu-logo {
  width: 52px;
  height: 52px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.edu-logo img { max-width: 100%; max-height: 100%; object-fit: contain; }
.edu-text { font-size: 1rem; color: var(--soft); line-height: 1.55; }
.edu-text strong {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.edu-date {
  font-family: var(--font-ui);
  color: var(--faint);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-left: 6px;
}
.edu-advisor { font-size: 0.9rem; color: var(--faint); }
.edu-advisor a { color: var(--soft); border-bottom: none; }
.edu-advisor a:hover { color: var(--pop-blue); border-bottom: 1px solid var(--pop-blue); }

/* ---------- HONORS ---------- */
.misc .honors { list-style: none; }
.misc .honors li {
  font-size: 0.97rem;
  color: var(--soft);
  padding: 5px 0 5px 20px;
  position: relative;
}
.misc .honors li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.85em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: transparent;
  border: 1.5px solid var(--ink);
}

/* ---------- FOOTER ---------- */
footer {
  border-top: 1px solid var(--line);
  padding-top: 22px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--faint);
  text-align: center;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 900px) {
  body { font-size: 19px; }
  .topnav-inner { padding: 12px 20px; gap: 18px; overflow-x: auto; }
  .layout { flex-direction: column; padding: 32px 22px 60px; }
  .sidebar { width: 100%; position: static; margin-bottom: 36px; }
  .content { width: 100%; padding-left: 0; }
  .author-avatar { width: 140px; height: 140px; }
  .pub { grid-template-columns: 240px 1fr; gap: 1.2rem; }
}
@media (max-width: 560px) {
  body { font-size: 18px; }
  .pub { grid-template-columns: 1fr; gap: 0.8rem; }
  .pub-thumb { max-width: 260px; }
  .date { min-width: 52px; }
  .talks li { grid-template-columns: 52px 1fr; }
  .talk-venue { grid-column: 2; text-align: left; }
  .news li { flex-direction: column; gap: 2px; }
}

/* ---------- MOTION PREFERENCES ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}